Serious Vibration Issues (Help)

[Surferdude]

Vehicle is a 2nd generation DSM (Eclipse GS-T) Manual Transmission,

The vehicle has 18 inch rims / eibach lowering springs (2 inch)

This problem starting occuring approx 4 months ago, what happens is when driving on the highway (nearing) 60 mph the car suddenly because violently shakey / gives off a bad vibration. The vibration only comes when you press the gas around 60 - 65 mph if you let off the vibration is gone.

For the most part the vibration sounds like it comes from the floor / tires (not the dash / steering wheel)

I haved replaced the following thinking it may be the problem. Lower Control Arms / Upper Control Arms / Control Arm Assembly / Tie Rods (both sides) / Rims centering rings.

I am not sure what is causing this problem

please let me know what it could be

 

[luv2rallye]

Does it happen in any gear around 60-65 MPH or always at the same rpm? What happens when you go 70mph and then put in neutral or hold clutch in (& let engine idle) and let it coast past 60?

Did you check the inner tie rod ends, upper arm shaft assembly bushings, shock assembly, lateral lower arm bushings and ball joint, compression lower arm ball joint? Jack up each front wheel seperately and see if you can move the wheel left/right and top/bottom with your hands on the tire (also do when on ground).